'Construct the Solar System' printed from http://nrich.maths.org/

The following table comprises real astronomical data (compiled from Wikipedia) which describe the elliptical paths taken by some key objects in our solar system:

Name

Diameter relative to Earth

Average distance from the sun (in AUs)

Time to orbit the sun (years)

Inclination of orbit to sun's equator (in degrees)

Orbital Eccentricity

e

Time to spin on axis (days)

The Sun

109

--

--

--

--

26.38

Mercury

0.382

0.39

0.24

3.38

0.206

58.64

Venus

0.949

0.72

0.62

3.86

0.007

-243.02

Earth

1.00

1.00

1.00

7.25

0.017

1.00

Mars

0.532

1.52

1.88

5.65

0.093

1.03

Jupiter

11.209

5.20

11.86

6.09

0.048

0.41

Saturn

9.449

9.54

29.46

5.51

0.054

0.43

Uranus

4.007

19.22

84.01

6.48

0.047

-0.72

Neptune

3.883

30.06

164.8

6.43

0.009

0.67

The actual numbers for the earth are

Diameter

Mass kg

Distance from sun

Orbital period

Rotation time

12756 km

5.9736 E10

147.1-152.1 million km

365.256366 days

23 hours 56 minutes

Make an accurate top down drawing of the solar system on, for example, a piece of A4 paper.

You will first need to try to make sense of the data in the table!

You could either assume that the orbits are all circular, centred on the sun. Or (a lot more tricky) you could take into account the eccentricity of the orbit: $e = \frac{r_{max}-r_{min}}{r_{max}+r_{min}}$ where $r_{max}$ and $r_{min}$ are the maximum and minimum distances from the sun respectively.

Once you have made your drawing, you can make a side-view to show the effects of inclination of the orbits.

In late April 2002 a grand conjunction occurred in which Mercury, Venus, Mars, Saturn and Jupiter were all visible from various places on Earth at night. What does this tell us about the possible range of locations of these planets of their orbits?

From this information, for which of the planets could you meaningfully predict their locations relative to earth now?

Extension:Estimate how often you would expect Mercury, Venus, Mars, Saturn and Jupiter to line up. How often might you expect all of the planets to line up?

NOTES AND BACKGROUND

Planetary conjunctions are beautiful to observe, as planets are the brightest 'stars' in the sky. You can see an image of a planetery conjunction here.